Biopyrrin is an oxidative metabolite of bilirubin. Biopyrrin is a tripyrrol moiety of bilirubin, including two regioisomers (biotripyrrin-a, 1,14,15,17tetrahydro-2,7,13-trimethyl-1,14-deoxy-3-vinyl-16Htripyrrin-8,12-dipropionic acid and biotripyrrin-b, 1,14,15,17-tetrahydro-3,7,13-trimethyl-1,14-deoxy2-vinyl-16H-tripyrrin-8,12-dipropionic acid: Fig. 1). For many years, bilirubin was regarded as...

The majority of the published reference range data on catecholamines excretion by healthy children is incomplete and often contradictory (1). We assayed in the urines of 127 healthy children the values of the catecholamines (norepinephrine, epinephrine, dopamine) and their methylated metabolites (normetanephrine, metanephrine, 3-methoxytyramine) for the determination of paediatric reference ran...

A sequential injection system based on the ABTS (2,2'-azino-bis-(3-ethylbenzothiazoline-6-sulphonic-acid) methodology was developed. The proposed method, incorporating a mixing chamber in the side port of the selection valve, was evaluated to measure the total antioxidant activity of several beverages and foods. The ABTS(+) is generated by oxidation of ABTS with potassium persulfate and is redu...

A novel spectrophotometric method for determination of tryptophan content in protein hydrolysates has been developed. The reagent used is diphenylamine sulphonate which is oxidised to diphenylbenzidine sulphonic acid after reacting with sodium nitrite in the sulphuric acid medium. The unstable oxidation product reacts quickly with sodium nitrite to produce a diazotized intermediate. When the di...

BACKGROUND/AIM The excessive apoptosis of intestinal epithelial cells (IECs) partly accounts for the development of colonic inflammation and eventually results in ulcerative colitis (UC). Humanin, an endogenous anti-apoptotic peptide, has previously been shown to protect against Alzheimer's disease and a variety of cellular insults. The present study aimed to investigate the effects of glysin v...